Machine for bending metal bars.



M. H. McKENNA.

MACHINE FOR SENDING METAL BARS.

f APPLICATION FILED OCT. l3.19i71 Patented Aug. 27, 1918.

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M- H. MCKENNA.

MACHINE run BENDING METAL ms. 1 I APPLICATIQN FlLED 0CT.|3,197- 1,277,235. Patented Aug. 27, 1918.

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M; H.'McKENNA. MACHINE FOB BENDING METAL BARS. APPLICATION FILED OCT. 13. 19H.

Patpnted Aug. 27, 1918 5 SHEETS-SHEET 3.

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M. H. McKENNA.

MACHINE FOR BENDING METAL BARS.

APPLICATION FILED OCT. 13. 1917.

Patented Aug. 27, 1918.

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M. H. McKENNA.

MACHINE FOR BENDING METAL BARS.

APPLICATION FILED OCT. I3. I9H.

Patented Aug. 27, 1918.

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To all whom it may concern," q 1 Be it known llflU'If MICI-IAEIJ H. b- KENNA, a-citiz en ofthe United States,-residing at Cleveland, in thecounty of Guyahoga and State of Ohio, have invented certain new and useful Improvements in Machines for Bending-Metal il3ars, of which the following is a specification. g

I-n'mypendingapplication SeriNo. 19635 5 there is disclosed a machine for bending bars or the like characterized by'the use of an oscillating shaft carrying a bending arm, and a drive gear which may beclutch'ed or latched to the shaft by an arm projecting therefrom, in order to turn the latter, the catch being automatically released at the end of the stroke.

The present invention is a modification of or improvement on a machineshown in said application, the object being to provide improved means for swinging the shaft back to original position after each strolre, uoon the release of the automatic catch. *urther features of the present invention relate to the devices for holding and bending the work, said devices including a. disk mounted on the. shaft, instead of the arm referred to.

In the accompanying drawings,

Figure 1 is a plan of the machine in one position.

Fig. 2 is a. similar View in another position. i

Fig. 3 is a side elevation. 6

Fig. 4 is a section on the-line H of Fig. 3.

Fig. 5 is a section on the line of Fig. 6 is a partlal sect-ion on the line 66 1 of Fig. 1.

Fig. 7 is a detail of the attaching device for the spring which returns the shaft.

In the drawings, 1 indicates the base of the machine, 2 a bed plate thereon, 3 a table supported by posts 1, 5, a. vertical shaft which extends through thetable and is supported ina stepbearing 6, 7 an upper bearingfor the shaft and 8 a gear loose on the shaft. Y

Fixed to the shaftfi is an arm 10 carrying a pivoted latch 14 mounted on a'pivot 12, at

the end of the arm 10 and provided with the hook 16 adapted to engage one of a series of lugs .9 on the wheel 8. This latch has a handle 17 which travels in a slot 18 in the nnoiimnroii gamm ETAL 7 I Specification of Iietters Patent Agg -2'57,

"nil; motor 34;;the" worm being supportedin tearing-s 52 and some of the gears being injclosed by a casing 58. The shaft 22 is sup ported in bearings at the top and the plates 2 and 3.

By engaging the bottom on latcliwith one ofthe lugs 9 the bending shaft 5 is turned in one direction, until the latch is released by the handle 17 striking the block 46. To turn the shaft to original position I provide a coiled spring 56 connected to one of the posts 4 and by a chain 55 to a fixture on the shaft-5. The spring may be adjusted bya nut 57. The" fixture referred to is indicated as a whole at 54 in Fig. 4 and consists (see Fig.

7) of a split collar 69 which matches witha removable section 71 having a' key Way 72 by which it may be keyed to the shaft. The collar sections are fastened together by a pin inserted through holes 7 6 in the part 69 and a hole 73 in the part 71. The collar has agroove 70 for the chain and a 1101075, in a lug 7 1 to receive a pin to connect the end of the chain. 7 y r Mounted at the top of the shaft 5,. above the table 3, is a disk 59 having a series of slots 61 and 62 to receive a pin 60 by which a bending roller 41 is adj-ustably attached to the disk. Two sets of slots 61 and 62 are provided to accommodate either right or left hand work. Mounted on the extreme upper. end of the shaft 5 is a roller or formeri4t2 around which the work is bent. 63 is a'block kinds of work. When used as a left hand.

machine the blocks 63 and 65 may here-.

versed andsecured by bolts in the holes 68,

desired position to accommodate different the bender 41 being then transferred'to one of the slots 62. V ,V V

In the operation of the machine, the bar to be bent is placed against the block 65 and; between the former 12 and bender 4:1, as shown inFig. 1. The clutch 16 is then en,- gaged' by swinging the handle .17 and the shaft Sand disk 59 are swung around, bendnal position for the next operation.

ing the bar around the former 42 as shown v in Fig. 2. The stop 46 being set at the desired place will throw out the latch or clutch when the bend is completed, and the spring 56, being then extended, will return the can be placed in and removed from the machine, the clutch being engaged by hand at the beginning ofeaeh-operation and automatically released and the bender returned at the end of eachioperation.

I claim: I

In a metal bending machine, the combination of an oscillatable bender shaft, means including a clutch to turn the shaft one way, means to release the clutch at the end of the stroke, and means to automatically return the shaftto original position after the clutch is released said means including a spring, and a collar on the shaft to which the spring is connected, said collar being reversible to connect the spring at eitherside of the shaft.

In testimony whereof, I do aifix my signature in presence of two witnesses.

MICHAEL H. MOKENNA. WVitnesses:

J OHN A. BOMMHARDT,

, Gr. V. ROSENBERG.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

. a I Washington, D. 0. 

